Buggy code:
public static String swapCase ( final String str ) { } public static int countMatches ( final CharSequence str , final CharSequence sub ) { } public static boolean isAlpha ( final CharSequence cs ) { } public static boolean isAlphaSpace ( final CharSequence cs ) { } public static boolean isAlphanumeric ( final CharSequence cs ) { } public static boolean isAlphanumericSpace ( final CharSequence cs ) { } public static boolean isAsciiPrintable ( final CharSequence cs ) { } public static boolean isNumeric ( final CharSequence cs ) { } public static boolean isNumericSpace ( final CharSequence cs ) { } public static boolean isWhitespace ( final CharSequence cs ) { } public static boolean isAllLowerCase ( final CharSequence cs ) { } public static boolean isAllUpperCase ( final CharSequence cs ) { } public static String defaultString ( final String str ) { } public static String defaultString ( final String str , final String defaultStr ) { } public static < T extends CharSequence > T defaultIfBlank ( final T str , final T defaultStr ) { } public static < T extends CharSequence > T defaultIfEmpty ( final T str , final T defaultStr ) { } public static String reverse ( final String str ) { } public static String reverseDelimited ( final String str , final char separatorChar ) { } public static String abbreviate ( final String str , final int maxWidth ) { } public static String abbreviate ( final String str , int offset , final int maxWidth ) { } public static String abbreviateMiddle ( final String str , final String middle , final int length ) { } public static String difference ( final String str1 , final String str2 ) { } public static int indexOfDifference ( final CharSequence cs1 , final CharSequence cs2 ) { } public static int indexOfDifference ( final CharSequence ... css ) { } public static String getCommonPrefix ( final String ... strs ) { } public static int getLevenshteinDistance ( CharSequence s , CharSequence t ) { } public static int getLevenshteinDistance ( CharSequence s , CharSequence t , final int threshold ) { if ( ( s == null ) || ( t == null ) ) { throw new IllegalArgumentException ( "Strings<seq2seq4repair_space>must<seq2seq4repair_space>not<seq2seq4repair_space>be<seq2seq4repair_space>null" ) ; } if ( threshold < 0 ) { throw new IllegalArgumentException ( "Threshold<seq2seq4repair_space>must<seq2seq4repair_space>not<seq2seq4repair_space>be<seq2seq4repair_space>negative" ) ; } int n = s . length ( ) ; int m = t . length ( ) ; if ( n == 0 ) { return m <= threshold ? m : - 1 ; } else if ( m == 0 ) { return n <= threshold ? n : - 1 ; } if ( n > m ) { final CharSequence tmp = s ; s = t ; t = tmp ; n = m ; m = t . length ( ) ; } int [ ] p = new int [ n + 1 ] ; int [ ] d = new int [ n + 1 ] ; int [ ] _d ; final int boundary = ( Math . min ( n , threshold ) ) + 1 ; for ( int i = 0 ; i < boundary ; i ++ ) { p [ i ] = i ; } Arrays . fill ( p , boundary , p . length , Integer . MAX_VALUE ) ; Arrays . fill ( d , Integer . MAX_VALUE ) ; for ( int j = 1 ; j <= m ; j ++ ) { final char t_j = t . charAt ( ( j - 1 ) ) ; d [ 0 ] = j ; final int min = Math . max ( 1 , ( j - threshold ) ) ; <START_BUG> final int max = Math . min ( n , ( j + threshold ) ) ; <END_BUG> if ( min > max ) { return - 1 ; } if ( min > 1 ) { d [ ( min - 1 ) ] = Integer . MAX_VALUE ; } for ( int i = min ; i <= max ; i ++ ) { if ( ( s . charAt ( ( i - 1 ) ) ) == t_j ) { d [ i ] = p [ ( i - 1 ) ] ; } else { d [ i ] = 1 + ( Math . min ( Math . min ( d [ ( i - 1 ) ] , p [ i ] ) , p [ ( i - 1 ) ] ) ) ; } } _d = p ; p = d ; d = _d ; } if ( ( p [ n ] ) <= threshold ) { return p [ n ] ; } return - 1 ; } public static boolean startsWith ( final CharSequence str , final CharSequence prefix ) { } public static boolean startsWithIgnoreCase ( final CharSequence str , final CharSequence prefix ) { } private static boolean startsWith ( final CharSequence str , final CharSequence prefix , final boolean ignoreCase ) { } public static boolean startsWithAny ( final CharSequence string , final CharSequence ... searchStrings ) { } public static boolean endsWith ( final CharSequence str , final CharSequence suffix ) { } public static boolean endsWithIgnoreCase ( final CharSequence str , final CharSequence suffix ) { } private static boolean endsWith ( final CharSequence str , final CharSequence suffix , final boolean ignoreCase ) { } public static String normalizeSpace ( final String str ) { } public static boolean endsWithAny ( final CharSequence string , final CharSequence ... searchStrings ) { } private static String appendIfMissing ( final String str , final CharSequence suffix , final boolean ignoreCase , final CharSequence ... suffixes ) { }

Fix:
final int max = ( j > ( ( Integer . MAX_VALUE ) - threshold ) ) ? n : Math . min ( n , ( j + threshold ) ) ;